CaltechAUTHORS
Published September 15, 2000 | Version Published
Book Section - Chapter Open

Variable fractionation of solar energetic particles according to first ionization potential

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Goddard Space Flight Center
  • 3. ROR icon Jet Propulsion Lab

Contributors

Abstract

The average composition of solar energetic particles (SEPs), like the solar corona, is known to be depleted in elements with first ionization potential (FIP) more than ~10 eV by a factor of approximately four. We examine evidence for event to event variations in the FIP-related fractionation of SEPs, following up a 1994 study by Garrard and Stone. In a survey of 46 SEP events from 1974 to 1999 the deduced FIP-fractionation varies by a factor of ~2 from event to event, with no apparent relation to charge-to-mass dependent fractionation patterns in these same events. These results are compared to similar variations observed in the solar wind.

Additional Information

© 2000 American Institute of Physics. Issue Date: 15 September 2000. This work was supported by NASA at the California Institute of Technology (under grant NAS5- 6912), the Jet Propulsion Laboratory, and Goddard Space Flight Center.

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Published - MEWaipcp00b.pdf

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Additional details

Identifiers

Eprint ID
28380
Resolver ID
CaltechAUTHORS:20111209-071511880

Funding

NASA
NAS5-6912
Goddard Space Flight Center
JPL

Dates

Created
2011-12-09
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Space Radiation Laboratory , Physics Department
Series Name
AIP Conference Proceedings
Series Volume or Issue Number
528
Other Numbering System Name
Space Radiation Laboratory
Other Numbering System Identifier
2000-23